Please help me out!

Discussion in 'The Projects Forum' started by hasnain_raza, Sep 21, 2011.

  1. hasnain_raza

    Thread Starter New Member

    Sep 21, 2011
    7
    0
    Hello bros!

    I m working on a solar project and making a buck converter to convert my 36.8v(panel) voltage to 24v(battery) but i fails to get exact values of components!!

    Will anybody help me please ??

    Thanks in advance!
     
  2. tgotwalt1158

    Member

    Feb 28, 2011
    111
    18
    Hi Hasnain!
    Use the IC in the out put of the 36 Volt panel :
    LM7824CT
    REGULATOR 24 VOLT 1AMP TO-220
    It can provide 24 volt DC up to 1A in the output.
     
  3. hasnain_raza

    Thread Starter New Member

    Sep 21, 2011
    7
    0
    i want out put current of 4A?
    I want to make buck converter?
    can you please tell me exact values of inductor and capacitor?
     
  4. tgotwalt1158

    Member

    Feb 28, 2011
    111
    18
    Upload diagram of the project you are working on then I will be in a better position to answer satisfactorily.
     
  5. hasnain_raza

    Thread Starter New Member

    Sep 21, 2011
    7
    0
    which diagram you will recommend for 38.2v to 24v buck converter with max 4A current?
     
  6. tgotwalt1158

    Member

    Feb 28, 2011
    111
    18
    Do you have these design specifications with you?
    Input voltage: (V)
    Output voltage: (V)
    Diode Voltage Drop (V)
    Transistor Voltage Drop (V)
    Frequency: (KHz)
    Output Current: (A)
    Minimum Output Current(A)=L
    Inductor Current Ripple (%)=L
    Output Voltage Ripple (%)
     
  7. wayneh

    Expert

    Sep 9, 2010
    12,086
    3,024
    Are you sure? Your panel probably has an open circuit voltage spec (36V) and a short circuit current spec (4A?). That doesn't mean you'll get both at the same time. In fact for maximum efficiency you'll want to load the panel with only enough current to drop the voltage to about 80% of its open circuit rating, or about 29V. That current will be far less than the short circuit current.

    In fact your battery may tolerate the current directly from your panel without any additional circuitry to reduce current. Without the specs of your panel (the current vs. voltage chart) and your battery, the experts here cannot give the best advice.

    A linear regulator as suggested would offer protection to the battery but is very inefficient. If the battery is lead-acid, you'd want to charge it at ~30V. The panel might put the IC at risk, since their upper voltage spec is just over 30V.
     
  8. tgotwalt1158

    Member

    Feb 28, 2011
    111
    18
    This one! If it is proper for you, tell me the specs I asked earlier then I will calculate the values of Inductor and capacitor for you.
     
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